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Toyama Chemical Co Ltd
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Toyama Chemical Co Ltd
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Application filed by Toyama Chemical Co LtdfiledCriticalToyama Chemical Co Ltd
Priority to ES444441ApriorityCriticalpatent/ES444441A1/en
Publication of ES444441A1publicationCriticalpatent/ES444441A1/en
A procedure for the preparation of new cephalosporins of general formula (I): **(See formula)** where R1 represents a hydrogen atom, a salt-forming cation or a blocking group and R2 represents an acetoxy, carbamoyloxy, 2- (5-methyl-l, 3, 4-thiadiazolyl) thio group or 5- (1-methyl) -l, 2,3,4-tetrazolyl) thio, the procedure of which is to react a compound represented by the general formula (II): **(See formula)** where R1 and R2 are as defined above and R3 represents a hydrogen atom, a group containing silicon or a group containing phosphorus, with a derivative reactive in the carboxyl group of a 4-ethyl-2,3-dioxo-l-piperazinocarboxylic acid represented by formula (III): **(See formula)** optionally in the presence of a base. (Machine-translation by Google Translate, not legally binding)
ES444441A1976-01-191976-01-19A procedure for the preparation of new cephalosporins. (Machine-translation by Google Translate, not legally binding)
ExpiredES444441A1
(en)